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4.3.
AMBIENT TEMPERATURE
IMPORTANT
To achieve the guaranteed performance figures, the maximum acceptable laboratory
ambient temperature is +25°C. At higher ambient temperatures, the minimum operating
temperature and rate of fall will be affected.
All refrigeration equipment, from home freezers to air-conditioning plant, performs a
heat exchange operation in which the refrigeration compressor acts as a heat pump to
transfer heat from the cooling coil (called the evaporator because this is where the gas
evaporates and absorbs heat) to the condensing coil (where the gas condenses and gives
up heat). The condensing coil is air-cooled, and assisted by a fan.
All air-cooled condensers need air movement around them in order to be able to give up
to the air the heat extracted from the cooling coil (and hence the cabinet).
If the ambient temperature is high (above +25°C) more air will be required around the
condenser to take up the same amount of heat At the same time the higher ambient
temperature transfers heat more quickly into the cabinet through the insulation, giving
the refrigeration unit more work to do to maintain low temperature conditions.
Excessively high ambient temperatures and poor ventilation will cause the refrigerator
compressor to overheat and inevitably reduce its working life - possibly even causing it
to burn out.
4.4. POWER SUPPLY
Cabinets designed for operation from a 13A supply are supplied with a 13A plug fitted.
Cabinets not supplied with a 13A plug are required to be hard wired by a competent
electrician to an adequate power supply by connection to the front panel power contactor.
Power requirements are shown on a plaque on the rear of the cabinet, The supply
frequency is 50Hz, unless stated otherwise. An EARTH connection is essential to all
chamber. In addition, if the chamber requires a 3 phase supply NEUTRAL is also
required.
WARNING
If the cabinet requires on-site commissioning do not switch on until it has been fully
commissioned, see section 4.2.2.
4.5. MAINS INTERRUPT BRIDGE
If the power supply to the cabinet fails for up to 30 seconds, the cabinet will restart and
continue the program from where it left off. However if the power supply interruption
lasts longer than approx 30 seconds the cabinet will fail-safe.
4.6.
DRAIN
An outlet nipple (usually copper pipe) is fitted to the cabinet (right hand side or back).
Connect a pipe to give a CONTINUOUS FALL to an OPEN DRAIN. Drainage
restriction could cause an airlock and consequent flooding of the treatment chamber.
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